//
// invert.fx
//

//---------------------------------------------------------------------
// Settings
//---------------------------------------------------------------------
float4x4 gWorldViewProjection : WORLDVIEWPROJECTION;

texture sBaseTexture;

//---------------------------------------------------------------------
// Sampler
//---------------------------------------------------------------------
sampler BaseSampler = sampler_state
{
    Texture = (sBaseTexture);
    AddressU = Mirror;
    AddressV = Mirror;
    MinFilter = Linear;
    MagFilter = Linear;
    MipFilter = Linear;
};

//---------------------------------------------------------------------
// Structure of data sent to the pixel shader ( from the vertex shader )
//---------------------------------------------------------------------
struct VSInput
{
    float3 Position : POSITION0;
    float2 TexCoord : TEXCOORD0;
};

struct PSInput
{
    float4 Position : POSITION0;
    float2 TexCoord : TEXCOORD0;
};

//------------------------------------------------------------------------------------------
// VertexShaderFunction
//------------------------------------------------------------------------------------------

PSInput VertexShaderFunction(VSInput VS)
{
    PSInput PS = (PSInput)0;
    PS.Position = mul(float4(VS.Position, 1), gWorldViewProjection);
    PS.TexCoord = VS.TexCoord;
    return PS;
}

//------------------------------------------------------------------------------------------
// PixelShaderFunction
//------------------------------------------------------------------------------------------
float4 PixelShaderFunction(PSInput PS) : COLOR0
{
    float4 color = tex2D(BaseSampler, PS.TexCoord);
    color.rgb = float3(1 - color.r, 1 - color.g, 1 - color.b);
    color.rgb = saturate(color.rgb);
    return color;
}


//------------------------------------------------------------------------------------------
// Techniques
//------------------------------------------------------------------------------------------
technique invert
{
    pass P0
    {
        VertexShader = compile vs_2_0 VertexShaderFunction();
        PixelShader = compile ps_2_0 PixelShaderFunction();
    }
}

// Fallback
technique fallback
{
    pass P0
    {
        // Just draw normally
    }
}